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Full Discussion: Clarification - Setting socket options at the same time when socket is listening
Special Forums IP Networking Clarification - Setting socket options at the same time when socket is listening Post 302515051 by jake24 on Monday 18th of April 2011 11:28:57 PM
Old 04-19-2011
Clarification - Setting socket options at the same time when socket is listening
I need clarification on whether it is okay to set socket options on a listening socket
simultaneously when it is being used in an accept() call?

Following is the scenario:-

-- Task 1 - is executing in a loop - polling a listen socket, lets call it 'fd', (whose file descriptor is global) for an incoming connection request with select() and then executing accept(fd,...) when a connection request arrives.
-- Task 2 - is a task that receives config commands from console and manipulates internal structures in response to them. As part of a particular command, it sets an option on the same listen socket using setsockopt(fd,....)

The option must be set on the listen socket fd ONLY when intimated to do so via a console command.

Can someone please clarify if it is okay to perform setsockopt on a socket when the same is being used in a simultaneous accept() call in another task?
 

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LEARN ABOUT SUNOS

listen

listen(3SOCKET) 					     Sockets Library Functions						   listen(3SOCKET)

NAME

       listen - listen for connections on a socket

SYNOPSIS

       cc [ flag ... ] file ... -lsocket -lnsl [ library ... ]
       #include <sys/types.h>
       #include <sys/socket.h>

       int listen(int s, int backlog);

DESCRIPTION

       To  accept  connections, a socket is first created with	socket(3SOCKET), a backlog for incoming connections is specified with listen() and
       then the connections are accepted with  accept(3SOCKET).  The listen() call applies only to sockets of type SOCK_STREAM or SOCK_SEQPACKET.

       The backlog parameter defines the maximum length the queue of pending connections may grow to.

       If a connection request arrives with the queue full, the client will receive an error with an indication of ECONNREFUSED for  AF_UNIX sock-
       ets.  If  the  underlying protocol supports retransmission,  the connection request may be ignored so that retries may succeed. For AF_INET
       and AF_INET6sockets, the TCP will retry the connection. If the  backlog is not cleared by the time the tcp times out, the connect will fail
       with ETIMEDOUT.

RETURN VALUES

       A 0 return value indicates success; -1 indicates an error.

ERRORS

       The call fails if:

       EBADF		       The argument s is not a valid file descriptor.

       ENOTSOCK 	       The argument s is not a socket.

       EOPNOTSUPP	       The socket is not of a type that supports the operation listen().

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       accept(3SOCKET), connect(3SOCKET), socket(3SOCKET), attributes(5), socket.h(3HEAD)

NOTES

       There is currently no backlog limit.

SunOS 5.10							    8 Nov 1999							   listen(3SOCKET)
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